Brake Warning Light
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the connector from the brake fluid warning switch. Release the parking brake pedal. Connect the terminals on the wire harness side of the level warning switch connector. Start the engine, check that the warning light lights up. If the warning light does not light up, test the bulb or wire harness.